hmmm - seems like this could be very dangerous technology.
Aside from the subliminal advertising, this could be turned into a Manchurian Candidate kind if thing if aimed at borderline psychotics and/or other unstable people.
Talk about mind control, very unsettling.
That already exists.
Look up Scopolamine and the Borachero bush from Colombia. They have already started using it for criminal activity in Colombia.